These giant volcano sponges in Antarctica are thought to be the world's oldest living animal, at 15,000 years old.

Southern Ocean waters and glacial forces transform the Antarctic ice into these stunning bridges and caves.

The remains of a doomed Antarctic plane, buried beneath layers of ice and snow, await those willing to do a bit of digging.

The best place to send your postcards home from Antarctica.

Antarctica's bustling metropolis, originally established by Richard E. Byrd.

This urban drawbridge gained eternal pop culture fame when the Blues Brothers jumped it while it was raised.

A headstone tells the sad story of a lost little boy and his pet dog.

The largest ancient burial mound in Ohio.

Inside, ancient treasures. Outside, modern contradictions.

The city is full of whimsical portals to another world.

An impressive century-old, to-scale topographical map of Guatemala.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

The iconic statue was moved to a new spot overlooking the James river after several years as a mascot for the local baseball team.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

Bubbling up from deep underground is the warm crystal clear water that fills the Warm Springs Pools, America's oldest spa.